Coupling means for ultra-short waves



March 26, 1940. A. EIICKEMEYER ET AL; 2,194,696

COUPLiNG MEANS FOR ULTRA-SHORT WAVES Filed April 20, 1939 INVENTORS ADOLF E/CKEMEYER ALFRED BEHRENS ATfoRNEY Patented Mar. 26, 1940 UNITED STATES PATENT OFFICE COUPLING MEANS FOR ULTRA-SHORT WAVES Application April 20, r .In Germany 7 Claims.

The present invention is concerned with a coupling means for ultra-short waves in which any desired transmitter or receiver stage is to be coupled in a variable way with another stage by the aid of a pivoted coil. Connection of the oscillatable or pivotable coupler coil, which, for ultra-short-wave work consists simply of a wire loop, with the rest of the circuit organization has heretofore been effected by way of sliding springs or flexible strands or cables which permit mechanical movement of the coupling coil. Mobile parts of this kind, however, involve serious drawbacks since, on the one hand, where sliding contacts are dealt with, disturbing actions will invariably arise due to faulty contact-making, while, on the other hand, the working safety is diminished for the reason that the life of the moving parts is short where the parts are in constant use. Moreover, parts of the said nature, 20 for short-wave work, means always an undesirable additional inductance and capacity. The aim and object of the invention is to obviate all of these difliculties.

According to the invention the pivoted coupling coil (wire loop) is capacitively coupled,

without the use of slide contacts or the like, with i the rest of the circuit organization, in such a way that one or more capacity coats or electrodes are fixedly associated with the pivoted or revoluble coil, the cooperating coats or electrodes being united with the rest of the circuit organization. By turning the coil, it is only the two capacity coats or electrodes which are revolved in relation to each other, and this does not mean any mechanical stress where air condensers are em ployed.

The invention shall now be described in more detail by reference to the drawing. Fig. 1a shows an arrangement as here disclosed in perspective. Fig. lb shows the same arrangement in top view. 4 denotes the coupler coil oscillable about the shaft 6. The coupler coil is in the form of a wire loop, the latter to be coupled with a circuit whose terminals are indicated at l and 8. This connec- "5 tion is established upon both sides of the coil by way of respective capacities, one of the electrodes which is indicated at 3 is fixedly connected with the coil or the wire loop so that the same will partake of the rotation when the coil or wire loop is revolved. The other capacity electrode l is united with the terminals l and 8 of the consumer or load circuit.

As can be seen from Fig. la the rotary capacity electrodes or rotors 3. are circular so that as these 5;; are rotated, the capacity value of the coupling 1939, Serial No. 268,880

April 13, 1938 (01. 250-40) capacities is not influenced. In other words, the capacitive coupling remains unvaried so that the degree of coupling of the two stages to be intercoupled is solely governed by the position of the inductance loop.

In a preferred embodiment of the invention, the coupling capacities established between members I, 2 are used at the same time as tuning capacities of the circuit including the coil. In order that these capacities may be tuned independentlyof the position of the coupling inductance 4' additional, preferably grounded, condenser coats or plates 2 are provided which are adapted to interleaveswith the coats I and 3 so that tuning is accomplishable by turning the other shaft 5.

The invention is not confined to the exemplified embodiment here shown. In fact, broadly speaking, it consists in using capacitive coupling of the oscillatable or revoluble coil in such a way that one capacity coat is fixedly united with the coil, while the other fixed coat is united with the rest of the circuit organization whenever sliding springs or the like can no longer be used in ultra-short-wave work because of difficulties due to contacts and of the stray (or additional) inductances. The invention is applicable to any short-wave equipment at all such as, for instance, the power stage of short-wave receivers in which a variable antenna coupling of the input stage is required. Terminals I and 8 in this case are directly united with the antenna, whereas the oscillatable wire .loop 4 is coupled with the receiver tube. The tuning of the receiver circuit is cfiected by the aid of the capacity surfaces 2 which are revoluble about the shaft 5.

What is claimed is 1. In an ultra-short wave coupling system comprising an oscillator circuit, a fixed coil, a movable coil in coupling relationship with said fixed coil,

vmeans for coupling said movable coil with the the rest of the circuit including a condenser electrode connected to said movable coil, a second condenser electrode adjacent to and in capacitive relationship with said first mentioned electrode, and a third electrode interposed between said first and second electrodes to vary the capacity therebetween.

2. In an ultra-short wave coupling system comprising an oscillator circuit, a fixed coil, a movable coil in coupling relationship with said fixed coil, means for coupling said movable coil with the rest of the circuit including a pair of condenser electrodes, each electrode connected to an end of'said movable coil, a second pair of electrodes,

each electrode being adjacent to and in capacitive relationship with each one of said first mentioned electrodes, and a third pair of electrodes, each electrode being interposed between said first and second electrodes to vary the capacity therebetween.

3. In an ultra-short wave coupling system comprising an oscillator circuit, a fixed coil, a movable coil in coupling relationship with said fixed coil, means for coupling said movable coil with the rest of the circuit including a pair of condenser electrodes, each electrode being directly connected to an end of said movable coil, a second pair of condenser electrodes, each electrode being adjacent to and in capacitive rela tionship with each one of said first mentioned electrodes and having connection means for connecting to said oscillator circuit, and a third pair of electrodes, each electrode being interposed between said first and second electrodes to vary the capacity therebetween.

4. In an ultra-short-wave coupling system comprising an oscillator circuit, a fixed coil, a movable coil in coupling relationship with said fixed coil, means for coupling said movable coil with the rest of the circuit including a pair of condenser electrodes, each electrode connected to an end of said movable coil, the shape of said electrodes being such that the condenser capacity remains constant when said coil is moved, a second pair of condenser electrodes, each electrode being adjacent to and in capacitive relationship with said first mentioned electrodes, and a third pair of electrodes, each electrode being interposed between said first and second electrodes to vary the capacity therebetween.

5. In an ultra-short wave coupling system comprising an oscillator circuit, a fixed coil, a movable coil in coupling relationship with said fixed coil, means for coupling said movable coil with the rest of the circuit including a shaft for said movable coil, a pair of condenser electrodes mounted on said shaft, each electrode connected to said movable coil, the shape of said electrodes being such that the capacity remains constant when said coil is moved by said shaft, 21, second pair of, electrodes, each electrode being adjacent to and in capacitive relationship with each one of said first mentioned electrodes, and a third pair of electrodes interposed between said first and second electrodes to vary the capacity therebetween.

6. In an ultra-short wave coupling system comprising an oscillator circuit, a fixed coil, 21 movable coil in coupling relationship with said fixed coil, means for coupling said movable coil with the rest of the circuit including a shaft for said movable coil, a pair of condenser electrodes mounted on said shaft, each electrode connected to said movable coil, the shape of said electrodes being such that the capacity remains constant when said coil is moved by said shaft, a second pair of electrodes, each electrode being adjacent to and in capacitive relationship with each one of said first mentioned electrodes, and a third pair of, electrodes. and a shaft for rotating said third pair of electrodes, each of said third electrodes being interposed between said first and second electrodes to vary the capacity therebetween.

'7. In an ultra-short wave coupling system comprising an oscillator circuit, a fixed coil. a

movable coil in coupling relationship with said fixed coil, means for coupling said movable coil with the rest of the circuit including a pair of circulanshaped condenser electrodes. each electrode connected to an end of said movable coil, I

ADOLF EICIQEMEYER. ALFRED BEHRENS. 

